#' Zip vectors into a single list
zip_vectors <- function(...){
x = list(...)
lapply(seq_along(x[[1]]), function(i) lapply(x, hof::pluck(i)))
}
#' Combine stylesheets in a directory
#'
#' @param css_dir directory containing stylesheets
combine_css <- function(css_dir, out_file){
css_files = dir(css_dir, pattern = '*.css', full = T)
if (missing(out_file)) out_file = file.path(css_dir, 'user.css')
css = paste(lapply(css_files, read_file), collapse = '\n')
writeLines(css, out_file)
}
#' Minify stylesheet using YUI Compressor
#'
#' @param css_file path to css file
minify_css <- function(css_file){
yui = file.path('inst', 'libraries', 'utilities', 'yuicompressor-2.4.7.jar')
min_css_file = gsub('.css', '.min.css', css_file)
cmd = 'java -jar %s %s -o %s'
system(sprintf(cmd, yui, css_file, min_css_file))
}
#' Binary operator useful for function composition
#'
`%|%` <- function(x, f){
f(x)
}
#'
# from hadley's httr package
"%||%" <- function(a, b) {
if (!is.null(a)) a else b
}
#' Read a text file into a single string
#'
#' @param doc path to text document
#' @return string with document contents
#' @keywords internal
read_file <- function(doc){
paste(readLines(doc), collapse = '\n')
}
#' Capture patterns matched by regular expression
#'
#' @keywords internal
re_capture <- function(pattern, string, ...) {
rex = list(src = string, names = list(),
result = regexpr(pattern, string, perl = TRUE, ...))
for (.name in attr(rex$result, 'capture.name')) {
rex$names[[.name]] = substr(rex$src,
attr(rex$result, 'capture.start')[,.name],
attr(rex$result, 'capture.start')[,.name]
+ attr(rex$result, 'capture.length')[,.name]
- 1)
}
return(rex)
}
#' Convert markdown document into html
#'
#' @import markdown
#' @keywords internal
md2html <- function(md){
renderMarkdown(text = md, renderer.options = markdownExtensions())
}
#' Merge two lists by name
#'
#' This is a method that merges the contents of one list with another by
#' adding the named elements in the second that are not in the first.
#' In other words, the first list is the target template, and the second
#' one adds ay extra elements that it has
#'
#' @param x the list to which elements will be added
#' @param y the list from which elements will be added to x, if they are not
#' already there by name
#' @keywords internal
merge_list <- function (x, y, ...){
if (length(x) == 0)
return(y)
if (length(y) == 0)
return(x)
i = match(names(y), names(x))
i = is.na(i)
if (any(i))
x[names(y)[which(i)]] = y[which(i)]
return(x)
}
#' Filter blanks
#'
#' @keywords internal
filter_blank <- function(x){
Filter(function(y) y != '', x)
}
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